24" by 30". Copyright symbol at bottom right 1978 Andy Warhol Enterprises. Warhol photographed Ali in 1977 for his Athletes Series. Provenance: From the estate of Rodney Hilton Brown who operated Hilton Fine Arts, Ltd., a gallery in Soho, New York in the 1970s. He was a lifelong friend of Muhammad Ali and represented him as an artist at this gallery. Brown collected a significant amount of Ali's artwork, which was later featured in his book, Muhammad Ali: The Untold Story: Painter, Poet & Prophet. These posters were found in Brown's attic.